/*
 * 
 * https://www.lintcode.com/problem/same-tree/
 * https://leetcode-cn.com/problems/same-tree/
 *
 * [100] 相同的树
 */

/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
 *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
 *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left),
 * right(right) {}
 * };
 */
class Solution {
   public:
    bool isSameTree(TreeNode* p, TreeNode* q) {
        if (!p && !q) return true;
        if (!p || !q) return false;
        return p->val == q->val && isSameTree(p->left, q->left) &&
               isSameTree(p->right, q->right);
    }
};
